J Lent

I installed ADR on my brothers 98.5 & got a fuel sender from the local store. The sender that quad provided with the Adrenaline is a 0-40psi, 240-33.5 ohm load. That sensor is way too picky for my taste. When driving down the road it jumps from 16psi, 4psi, 11psi, 8psi on a hard run at steady throttle while my mechanical reads a steady 16-14psi. This got me thinking, what if I widen the psi range at the same ohm load? I bought a Stewart Warner #701-1565 pressure sender [0-100psi, 240-33.5 ohm] & installed it in my brothers truck leaving the mechanical gauge to compare pressures. At idle they both read 15psi [fuel psi adjustment on Pulse is set all the way down] At wot the mechanical gauge reads 8psi while the Pulse reads 12psi. That tells me that I took too big of a step on the psi range of my sender. I am willing to bet that a 0-80psi, 240-33.5 ohm load would read identical to a mechanical gauge. I am going to order one & find out.

J Lent

Here is a graph explaining my hillbilly logic.
Attachment 22714

xtoyz17

What does the fuel adjustment in the pulse do? Does it scale it linearly as a PSI offset to bring your readings back to accurate, or is it "stretching" or "shrinking" the scaling to allow use of different senders?

edit: Forgot to mention the reason we have senders with such a narrow range is because, and this is if I remember right, the broader range senders seem to start reading inaccurately at the lower pressures we need them for. Not only that but their "clarity" isn't as good as it should be, and we might get a 5 psi fluctuation and never know it.

I guess it depends on what your intended goal is

J Lent

Say you have a 40psi scale like provided with the Adrenaline, the "most accurate" position on that scale will be somewhere in the middle of the gauge within 2 boundary points. The Pulse allows you to adjust the accuracy by changing the boundary points. The problem with the 40psi sender is that the ohms change drastically over a 5psi change causing the psi reading to jump around. With the 100psi sender, It is closer to matching my mechanical because the ohms hardly change over a 5psi change. This is why it is so much closer to matching my mechanical gauge. The 40psi sender shows 2psi briefly at times on a hard run although my mechanical gauge is showing 14psi. I have 80k miles problem free on this vp44 using this mechanical gauge, I trust it & want them to match.

xtoyz17

Did you ever get the new sender to try?

J Lent

No, the local Napa can't get it. I think I am just gonna order the quad sensor & say P.O.I.

isu elvi

Is there any reason we HAVE to run a fuel sender with the ADR. I didnt get one with my box, so I just continue to rely on the mech. guage I had previously. Do we get extra control with it on, or is it just to have fuel pressure shown on the Pulse?
Thanks,

xtoyz17

Only thing you're really missing out on is defueling options based on fuel pressure. No biggie really.

12valve

i didnt get a fuel pressure sender, whats the deal??

i need one! i dont have a mech gauge, i used to rely on the edge attitude

wurkenman

The fuel sender on Quads website looks just like the stock one on my Harley Electra Glide.